noun
the Pentagon; U.S. Department of Defense
Used as a proper noun or metonym in news and political contexts for the U.S. Department of Defense, and sometimes by extension its headquarters.
ペンタゴンは新しい防衛戦略を発表した。
The Pentagon announced a new defense strategy.
noun
Rare as a Japanese term for the shape; 五角形 is the normal word in mathematics and everyday explanation.
See also: 五角形
図形としての「ペンタゴン」は、普通は五角形と言う。
The shape called a “pentagon” is normally called 五角形 in Japanese.